Importance of Mycorrhizae in Tropical Soils

Cardoso, Elke Jurandy Bran Nogueira; Nogueira, Marco Antônio; Zangaro, Waldemar

doi:10.1007/978-3-319-55804-2_11

Cited by 15 publications

(11 citation statements)

References 60 publications

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“…Arbuscular mycorrhizal fungi may have little direct access to calcium phosphates themselves, but the external mycelium may be associated with phosphate‐solubilizing bacteria, which act as mycorrhizal helpers (Frey‐Klett et al 2007). The AM fungi have a special affinity for phosphate (Cardoso et al 2017) and scavenge this from large volumes of soil (Smith et al 2011). This was supported by the much higher microbial P content in calcareous than in acidic dunes, as well as the lower microbial C:P ratios.…”

Section: Discussionmentioning

confidence: 99%

“…Arbuscular mycorrhizal plants may be less common in acidic dunes, because arbuscular fungi are sensitive to low pH (Van Aarle et al 2002). However, AM plants and fungi do occur in acidic soils (Kluber et al 2012), especially in tropical climates (Cardoso et al 2017). In tropical soils, inorganic P may be present in Fe or Al phosphates, but their availability is restricted due to low solubility at low pH (Lindsay and Moreno 1966, Hinsinger 2001).…”

Section: Discussionmentioning

confidence: 99%

“…However, organic C contents in the tropical soils were approximately seven times lower. This may restrict formation of humic Fe‐OM complexes and stimulate strong P binding to Fe oxides, which may explain why many acidic tropical soils are dominated by AM rather than NM plants (Cardoso et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…In coastal dune grasslands, arbuscular mycorrhizal (AM), ericoid mycorrhizal (ErM), and nonmycorrhizal (NM) plants may all occur (Ernst et al 1984, Van Til and Mourik 1999), but distribution patterns probably change with pH and SOM. The AM and NM plants mainly use inorganic P and can be found at both high pH and low pH (Emmerton et al 2001, Read and Perez‐Moreno 2003, Smith and Smith 2011, Cardoso et al 2017). For AM plants, mycorrhizal benefits are especially high when P is a limiting factor (Hoeksema et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Resilience in coastal dune grasslands: pH and soil organic matter effects on P nutrition, plant strategies, and soil communities

et al. 2020

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2020. Resilience in coastal dune grasslands: pH and soil organic matter effects on P nutrition, plant strategies, and soil communities. Ecosphere 11(5):Abstract. Soil organic matter (SOM) and pH are key ecosystem drivers, influencing resilience to environmental change. We tested the separate effects of pH and SOM on nutrient availability, plant strategies, and soil community composition in calcareous and acidic Grey dunes (H2130) with low, intermediate, and/or high SOM, which differ in sensitivity to high atmospheric N deposition. Soil organic matter was mainly important for biomass parameters of plants, microbes, and soil animals, and for microarthropod diversity and network complexity. However, differences in pH led to fundamental differences in P availability and plant strategies, which overruled the normal soil community patterns, and influenced resilience to N deposition. In calcareous dunes with low grass-encroachment, P availability was low despite high amounts of inorganic P, due to low solubility of calcium phosphates and strong P sorption to Fe oxides at high pH. Calcareous dunes were dominated by low-competitive arbuscular mycorrhizal (AM) plants, which profit from mycorrhiza especially at low P. In acidic dunes with high grass-encroachment, P availability increased as calcium phosphates dissolved and P sorption weakened with the shift from Fe oxides to Fe-OM complexes. Weakly sorbed and colloidal P increased, and at least part of the sorbed P was organic. Acidic dunes were dominated by nonmycorrhizal (NM) plants, which increase P uptake through exudation of carboxylates and phosphatase enzymes, which release weakly sorbed P, and disintegrate labile organic P. The shifts in P availability and plant strategies also changed the soil community. Contrary to expectations, the bacterial pathway was more important in acidic than in calcareous dunes, possibly due to exudation of carboxylates and phosphatases by NM plants, which serve as bacterial food resource. Also, the fungal AM pathway was enhanced in calcareous dunes, and fungal feeders more abundant, due to the presence of AM fungi. The changes in soil communities in turn reduced expected differences in N cycling between calcareous and acidic dunes. Our results show that SOM and pH are important, but separate ecosystem drivers in Grey dunes. Differences in resilience to N deposition are mainly due to pH effects on P availability and plant strategies, which in turn overruled soil community patterns.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Resilience in coastal dune grasslands: pH and soil organic matter effects on P nutrition, plant strategies, and soil communities

et al. 2020

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“…A solution to this problem is the biotechnological use of arbuscular mycorrhizal fungi (AMF), which can enhance plant P uptake (Cardoso et al, 2017) and growth of coffee seedlings (Rivillas & Dodd, 1996;Osorio & Habte, 2014), due to its capability to explore higher soil volume through extra-radical hyphae (Andrade et al, 2009). These effects are also positive under drought conditions, where AMF colonization efficiently makes use of water conditioning the plant stomatal opening and the leaf turgor (Augé, 2004).…”

Section: Introductionmentioning

confidence: 99%

Plant growth and phosphorus uptake of coffee seedlings through mycorrhizal inoculation

González-Osorio

Góngora²,

Padilla³

et al. 2022

Agron. Colomb.

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Soil phosphorus (P) availability is a limiting factor for coffee seedling growth. Usually, large amounts of P fertilizers are required, generating nutritional imbalance, increasing production costs, and raising environmental concerns in water pollution. The use of arbuscular mycorrhizal fungi (AMF) can enhance plant P uptake and growth and reduce the dose of P fertilizers. A greenhouse experiment was conducted in a substrate containing Paleudult soil and quartz sand, with low level of soluble P (1 mg kg-1), to establish the effect of AMF inoculation with Rhizoglomus fasciculatum on coffee (Coffea arabica L. cv. Colombia) seedlings growth and P uptake under three levels of P in soil solution (0.002, 0.02, and 0.2 mg L-1). AMF colonization was significantly reduced when contents of P in solution increased. Shoot dry weight and P foliar concentration were increased by the AMF inoculation when soil P in solution was 0.02 mg L-1; these effects were lower at 0.2 mg L-1 and null at 0.002 mg L-1 P. Results showed that AMF inoculation can play an important role in the growth of coffee seedlings as long as the content P in soil solution maintains intermediate level. At the lowest P level, the response of coffee seedlings to AMF inoculation was ineffective, while at the highest level, AMF application was unnecessary for coffee growth.

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